TWI434737B - Heat treatment apparatus for powder material - Google Patents

Description

Powder heat treatment device

The present invention relates to a powder heat treatment apparatus which can smoothly extract the gas generated from the powder material in the heating stage when the powder material is heat-treated at a high temperature of about 1,500 ° C or higher. The bridging of the cooling stage is prevented, and the fluidity of the powder material is ensured, and the powder material can be uniformly heat-treated.

Conventionally, Patent Document 1 is known as an apparatus for heat-treating a powder. The object of the "shaft furnace for powder processing" of Patent Document 1 is to provide a shaft furnace for powder processing which can be easily configured to prevent bridging in the raw material supply hopper and prevent a large reduction in air between the powders. Oxidation of the powder, etc., the shaft furnace for the powder processing is configured as a closed-type raw material supply hopper having a raw material supply pipe at the lower end and a raw material supply valve on the raw material supply pipe, and a raw material supply valve a furnace body having a heating unit and a cooling unit, and a discharge chamber including a batch discharge device; and connected in the above-described order, the raw material supply pipe is placed in the loading chamber, so that the upper end of the cylindrical shaft is installed in the room and The raw material supply pipe is opposed to each other and the lower end is located in the discharge chamber. In this manner, the furnace body is vertically disposed, and the raw material powder in the raw material supply hopper is supplied to the upper end of the cylindrical shaft, and is intermittently cut by the discharge plate. Process the powder.

Used as a bridge to prevent powder in general equipment for processing powders. Technically, Patent Documents 2 to 6 are known.

The object of the "hopper device" of Patent Document 2 is to provide a hopper device having a bridge preventing mechanism that facilitates agitating a wide range with a small force; the hopper device includes: a storage container that accommodates the granular body The powder granules are discharged through the discharge port by opening the discharge port provided at the lower portion, and the bridge preventing mechanism prevents the inside of the storage container from bridging due to the powder granules. The bridge preventing mechanism includes a rotating shaft and a plurality of stirring rods that extend radially along the one or more inclined surfaces that are inclined with respect to a central axis of the rotating shaft.

The object of the "Powder Storage Tank Device" of Patent Document 3 is to provide a powder and granular storage tank device which can prevent internal flow phenomenon, bridging phenomenon, or residual ‧ fixation phenomenon, and the like The powder and granules flow smoothly to ensure first-in first-out, and the structure is simple, and can also be attached to the conventional device; and the powder and granular storage tank device is provided with a can body, which is connected to the lower portion of the cylindrical body. a conical portion having a conical shape and a discharge port at a top end of the lower end of the conical portion; and the powder and granular storage tank device is attached to the inside of the can body by the support leg from the tapered portion at a specific interval It is configured by providing a conical portion having a top opening.

The object of the "brid bridge preventing and removing device" of Patent Document 4 is to prevent the occurrence of bridging of the powder in the powder storage tank or to remove the briquettes of the powder generated in the powder storage tank, and is simple and Easily disposed on the existing powder storage tank; the bridging prevention and removal device of the powder is respectively at the upper end a portion having a powder inlet port and a discharge port having a powder at a lower end portion, and a powder storage tank formed in a lower portion in a hopper shape; the bridge preventing and removing device for the powder is configured as follows. The invention comprises: a vibrating body disposed in a layer of a powder stored in a powder storage tank; a vibrating machine mounted on the vibrating body to vibrate the vibrating body; and a support body supporting the vibrating body and the vibrating body The powder storage tank; and the bridging prevention and removal device of the powder directly imparts vibration to the powder in the powder storage tank.

The purpose of the "storage tank for pulverized material" of Patent Document 5 is to provide a storage tank for pulverized material which can be smoothly discharged from the discharge port without bridging or hollowing the pulverized material stored directly above the discharge port; The storage tank of the pulverized material includes: a tank body that stores the pulverized material that has been pulverized and recovered; and a discharge port of the pulverized material that is disposed at a lower portion of the tank body; and the storage tank of the pulverized material is formed to have a pulverized material The hollowing and bridging preventing element is configured such that the hollowed-up and bridging preventing element of the pulverized material mechanically moves the upper end of the pulverized material stored in the can body and the portion reaching the discharge port in the vertical direction .

The "bridge-removing device for a storage bin" of Patent Document 6 is provided with a take-out port at a lower end of the storage body of the storage powder, and a plurality of high-pressure air nozzles for discharging high-pressure air into the body of the storage bin at a position above the take-out port. . The utility model is configured as follows: a high-pressure air supply pipe for supplying high-pressure air to other systems is branched on a front surface of the cooler to form a branch pipe of the high-pressure air supply pipe, and the branch pipe is connected to the high-pressure air nozzle; Before the device The high-temperature dried high-pressure air that has been shunted is sprayed from the high-pressure air nozzle through the branch pipe to the body of the storage bin, thereby preventing the bridging of the powder in the body of the storage bin without imparting moisture to the powder. Since the existing high-pressure air is utilized, simplification of equipment and cost reduction can be achieved.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-26413

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-6402

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2001-278384

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2003-63590

[Patent Document 5] Japanese Patent Laid-Open No. Hei 8-333024

[Patent Document 6] Unexamined Japanese Patent Publication No. 5-58692

In a device for producing a carbon powder by performing a graphitization treatment on a carbon powder contained in a negative electrode active material for a lithium ion secondary battery or a green coke, a pitch, a resin, or the like, the powder is applied at a high temperature of 1,500 to 2,000 ° C or higher. The bulk material is heat treated. During the heating phase, the impurities contained in the powder material are vaporized, and the powders are fixed to each other by the generated gas, thereby hindering the fluidity of the material. Further, in the cooling stage, the powder materials agglomerate each other to form a bridge, thereby also hindering the fluidity of the material.

The stirring operation disclosed in Patent Documents 2 to 6 for the flow of the powder materials The kinetic hindrance is effective. However, for the heat treatment at a high temperature of 1,500 ° C or higher, the bridge preventing mechanism or the like provided in the hopper apparatus or the like which is used at substantially normal temperature cannot be directly applied.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a powder heat treatment apparatus which can be smoothly extracted when a powder material is heat-treated at a high temperature of about 1,500 ° C or higher. The gas generated from the powder material during the heating phase can also prevent the bridging of the cooling stage, and it can ensure the fluidity of the powder material, and can also heat-treat the powder material homogeneously.

The powder heat treatment apparatus of the present invention is characterized by comprising: an upper loading portion which can be filled with a powder material; and a heat treatment portion which is connected below the upper loading portion to allow the powder material to be loaded on one side Heat treatment is performed while guiding downward in the direction of gravity; a lower discharge portion is connected below the heat treatment portion to discharge the heat-treated powder; and an upper stirring member is directed downward from the heat treatment portion Inserting to agitate the powder surface portion of the powder material in the heat treatment portion and the periphery thereof; and inserting the lower agitating member upward from the lower portion of the heat treatment portion and at a distance from the upper stirring member. Stirring the powder material in the heat treatment portion; and driving a member that drives the upper agitating member and the lower agitating member.

The present invention is characterized in that the upper agitating member is made of graphite, and a metal braking force transmitting member is coupled to the upper agitating member, and the metal braking force is The transmission member is rotatably and slidably inserted into the heat treatment portion via a sealing material.

The present invention is characterized in that a heating device is built in at least one of the upper agitating member and the lower agitating member.

In the powder heat treatment apparatus of the present invention, when the powder material is heat-treated at a high temperature of about 1,500 ° C or higher, the gas generated from the powder material in the heating stage can be smoothly extracted, and The bridging of the cooling stage is prevented, and the fluidity of the powder material is ensured, and the powder material can be uniformly heat-treated.

Hereinafter, a preferred embodiment of the powder heat treatment apparatus of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a side cross-sectional view showing the powder heat treatment apparatus 1 of the present embodiment. The powder heat treatment apparatus 1 of the present embodiment mainly includes a hollow cylindrical furnace body casing 2, the upper portion of which is straight in the height direction and the lower portion is branched into two, and the upper loading portion 3 is formed. It is disposed above and to the side of the furnace body casing 2, and can be filled with a powder material P into the furnace body casing 2; and a lower discharge portion 4 disposed at a lower portion of the furnace body casing 2, which can be from the furnace body casing 2 The heat-treated powder P is discharged inside.

The powder material P is, for example, a negative electrode active material for a lithium ion secondary battery, green coke, pitch, or a resin, and is heated to a height of 1,500 to 2,000 ° C or higher. The graphitization treatment is carried out at a temperature, whereby a carbon powder can be obtained. Of course, it can also be other powder materials.

The furnace body casing 2 constitutes a heat treatment portion that heat-treats the powder material P. The heat treatment section includes a heating belt H and a cooling belt C. The heating belt H is fitted to the upper portion of the furnace casing 2, and the cooling belt C is assembled to the furnace casing 2 by branching into two strands and extending downwardly downwardly from one of the lower portions. The other lower portion which is branched downward into the lower portion in the height direction of the furnace casing 2 constitutes the insertion portion 6 for providing the lower agitating member 5 described below. The lower discharge portion 4 is provided on the cooling belt C side.

Inside the furnace casing 2, the guide shaft 7 is disposed with a gap between the furnace casing 2 and the furnace casing 2. The guide shaft 7 is formed of a material having excellent heat resistance such as graphite. The guide shaft 7 is formed in a hollow cylindrical shape in substantially the same manner as the furnace body casing 2 in which the lower portion is branched into two, and is provided from the heating belt H across the cooling belt C and the insertion portion 6.

In the heating belt H, between the furnace casing 2 and the guide shaft 7, a heater 8 is disposed to surround the guide shaft 7, and between the heater 8 and the furnace casing 2, a heat insulating material 9 is filled. . The heater 8 can heat the guide shaft 7, thereby heating the inside of the guide shaft 7.

On the other hand, in the cooling zone C, the cooling water W is circulated from the outside in the gap between the furnace body casing 2 and the guide shaft 7, thereby constituting the water-cooling jacket 10 for cooling the inside of the guide shaft 7. .

On the upper part of the furnace casing 2, an opening portion covering the upper end of the guide shaft 7 is provided 7a and a hollow box-shaped upper casing 11 having airtightness. An upper loading portion 3 into which the powder material P can be inserted into the guide shaft 7 is connected to the upper casing 11.

The upper loading unit 3 includes a supply hopper 12 that temporarily stores the powder material P for supplying the powder material P to be heat-treated to the heating belt H of the guide shaft 7 , and an opening and closing valve 13 that is provided in the supply hopper 12 . At the lower end opening, the opening and closing operation is performed to release the powder material P from the supply hopper 12; and the ejector 14 is connected to the opening and closing valve 13 at one end and inserted into the upper casing 11 at the other end, so that the self-opening valve can be opened. The powder material P released in Fig. 13 flows down into the guide shaft 7, and the ejector 14 is connected to the upper casing 11, whereby the heating belt H of the heat treatment portion is connected below the upper loading portion 3.

The powder material P loaded into the guide shaft 7 from the upper loading portion 3 is filled from the heating belt H and the cooling belt C and the insertion portion 6. A lower discharge portion 4 is provided at a lower end of the cooling belt C of the furnace casing 2.

The lower discharge portion 4 includes a turntable 15 having a cutout hole 15a communicating with the lower end opening portion 7b of the guide shaft 7, and a water-cooling type disk sleeve 16 mounted and supported on the furnace body casing 2 to guide the turntable 15 therein The inner sliding rotation rotates, and the discharge port 16a communicating with the cutout hole 15a is formed to avoid the position of the lower end opening portion 7b; and the rotary motor 17 is disposed on the disk sleeve 16 to rotatably drive the turntable 15; and, the disk cover 16 It is connected to the furnace casing 2, whereby the lower discharge portion 4 is connected to the lower side of the cooling belt C of the heat treatment portion.

The powder P that has been cooled by the cooling zone C flows into the cut-out hole 15a of the turntable 15 that communicates with the lower end opening 7b of the guide shaft 7, and the powder P that flows in The rotation of the turntable 15 driven by the rotary motor 17 is cut out from the guide shaft 7 and transferred into the discharge port 16a in the sleeve 16, and thereafter, the cut-out hole 15a communicates with the discharge port 16a. The powder P is discharged from the inside of the disk cover 16 to the outside.

In a state where the self-heating belt H spans the cooling belt C and the insertion portion 6 and is filled with the powder material P, the powder P is discharged from the lower discharge portion 4 by the turntable 15, and the hopper 12 is supplied from the hopper 12 by the opening and closing valve 13. The powder material P is supplied, whereby the guide shaft 7 guides the powder material P downward in the direction of gravity, whereby the powder material P is continuously subjected to heat treatment inside the furnace body casing 2.

Gas is generated in the guide shaft 7 by the heat treatment of the powder material P. An exhaust pipe 18 for exhausting gas is connected to the upper casing 11 which is located above the guide shaft 7 and communicates with the upper end opening portion 7a. In order to control the pressure inside the guide shaft 7, the exhaust pipe 18 is provided with a regulating valve 19 for opening degree adjustment.

In the inside of the guide shaft 7 corresponding to the position of the heating belt H of the heat treatment portion, the upper agitating member 20 is inserted from the upper side toward the lower side, and is used to fill the inner surface of the guide shaft 7 and the center of the guide shaft 7 The powder surface portion (upper surface portion) of the powder material P in the guide shaft 7 and the periphery including the powder surface portion to the lower portion in the depth direction are stirred and flow.

In the present embodiment, the upper agitating member 20 has a rod shape having a tapered tip end, and a stirring agitating member 20a is provided on the circumferential surface thereof at intervals in the circumferential direction and in a plurality of stages in the longitudinal direction. The upper stirring member 20 is heat resistant It is formed by excellent graphite. In the upper agitating member 20, a metal brake force transmitting member 21 formed in a rod shape is coupled to a base end opposite to the front end of the upper end of the guide shaft 7 inserted into the high temperature and at the lower end portion of the outer casing 11.

The upper housing 22 is provided with an upper pedestal 22, and is mounted on an output shaft of the upper driving unit 23 of the upper pedestal 22, and the upper agitating member 20 is coupled via the power transmission member 21. The upper casing 11 is formed with a through-hole 24 through which the power transmission member 21 can be inserted. Thereby, the upper stirring member 20 is inserted from the inside of the upper pedestal 22 side guide shaft 7 and is provided.

The upper drive element 23 includes a screw mechanism or the like, and outputs a forward/reverse reciprocating rotational motion and a linear motion in the vertical direction from the output shaft, whereby the upper agitating member 20 is rotated forward and backward in the guide shaft 7, and the vertical direction is simultaneously performed. Round trip action.

As shown in FIG. 2, a sealing material 25 is provided in the upper through hole 24, which can maintain the airtightness of the upper casing 11 at a high level, and can also be used for the metal power transmission member 21 to rotate and slide up and down. Sliding freely.

The connection between the dissimilar material, that is, the graphite upper agitating member 20 and the metal power transmitting member 21 is, for example, as shown in FIG. 2, and is formed on the outer periphery of the end flange 21a of the power transmitting member 21 in order to ensure the transmission of the linear motion. The male screw portion 21b (in the figure, the cross section of the end flange 21a is indicated by hatching), and the female screw portion 26a is screwed, and the female screw portion 26a is formed to be engaged with the upper side stirring. The inner circumference of the coupling member 26 of the end flange 20b of the member 20, and in order to ensure the transmission of the rotational motion, avoiding the axes of the upper agitating member 20 and the power transmitting member 21, the key 27 is fitted into the formation. In the keyways of the end flanges 20b, 21a.

In the inside of the guide shaft 7 corresponding to the position of the heating belt H of the heat treatment portion, the lower agitating member 5 is inserted from the lower side toward the upper side, and is used to fill the inner surface of the guide shaft 7 and the center of the guide shaft 7 The powder material P in the guide shaft 7 is stirred and flows. The lower agitating member 5 is disposed at a distance from the upper agitating member 20 in the height direction of the guide shaft 7. Therefore, in the guide shaft 7, a region Z in which the agitation members 5, 20 are not present is set.

Similarly to the upper agitating member 20, the lower agitating member 5 has a rod shape having a tapered tip end, and agitating agitating member 5a is provided on the circumferential surface thereof at intervals in the circumferential direction and in a plurality of stages in the longitudinal direction. The lower agitating member 5 is also formed of graphite which is excellent in heat resistance.

The lower pedestal 28 is attached directly below the insertion portion 6 of the furnace casing 2, and the lower agitating member 5 is directly coupled to the output shaft of the driving element 29 mounted on the lower portion of the lower pedestal 28. At the lower end of the insertion portion 6, a lower through hole 30 through which the lower agitating member 5 is inserted is formed. Thereby, the lower agitating member 5 is inserted from the lower pedestal 28 side into the inside of the guide shaft 7.

Similarly to the upper driving element 23, the lower driving element 29 outputs a forward-reverse reciprocating rotational motion and a linear motion in the vertical direction from the output shaft, thereby causing the lower agitating member 5 to perform a forward-reverse rotation operation in the guide shaft 7, and simultaneously up and down Direction reciprocating action.

In the lower through hole 30, similarly to the upper through hole 24, a sealing material 31 is provided, which can maintain airtightness, and can also be rotatably slidable in the lower agitating member 5 and slidably inserted in the vertical direction. Similarly to the upper agitating member 5, the metal braking force transmission member is connected to the lower agitating member 5, and the power transmitting member can be inserted into the sealing material 31 to improve airtightness.

In order to control the operation of the powder heat treatment apparatus 1, the guide shaft 7 is provided with a laser position sensor 32 capable of detecting the position of the powder surface of the loaded powder material P, or a temperature for detecting the internal temperature. Sensor 33. The position sensor 32 is mounted by being insulated from the high-temperature heat treatment portion H by a transparent material such as glass.

Next, the action of the powder heat treatment apparatus 1 of the present embodiment will be described. When the operation state of the powder material P is filled in the range from the heating belt H to the cooling belt C and the insertion portion 6, the operation of discharging the heat-treated powder P from the lower discharge portion 4 is performed from the top. The inlet portion 3 supplies the powder material P, whereby the powder material P is guided downward in the direction of gravity by the guide shaft 7, and the heat treatment of the powder material P is continuously performed.

In the loading timing of the powder material P under the operation control, the opening and closing valve 13 is controlled in such a manner as to correspond to the discharge operation by the turntable 15, and is set at, for example, a height position of the powder material P of 1500 ° C. The detection point to be measured by the position sensor 32 is not detected by the position sensor 32. When the powder material P is refilled into the powder material P, or if the temperature of the powder surface position detected by the temperature sensor 33 reaches, for example, 1500 ° C, the powder material P is refilled.

The powder material P newly loaded into the heating portion H from the upper loading portion 3 is deposited on the powder material P which has been filled inside the guide shaft 7 by the ejector 14 to form a powder surface portion. . The powder material P immediately after the loading contains impurities, and in the process of sequentially heating the powder material P by the heater 8, the impurities are self-stagnation in the powder surface portion and include the powder. The powder material P in the periphery of the surface portion in the depth direction is gasified.

The forward-reverse rotation operation and the upper-side agitating member 20 can be reciprocated in the vertical direction, and the powder material P and the powder material P around the powder surface are stirred and fluidized, so that the generated gas is not retained in the powder. The materials P are placed between each other, and the self-flowing powder material P is smoothly released to the upper side of the powder surface along the upper side agitating member 20.

Further, by the stirring action of the upper stirring member 20, the powder material P can be uniformly heat-treated regardless of the periphery of the upper stirring member 20 or the vicinity of the inner surface of the guide shaft 7, and the gas can be uniformly released. Out. Therefore, the deaeration treatment of the powder material P from the powder surface portion and its peripheral portion can be surely performed by the graphite-based upper agitating member 20 having heat resistance. The released gas is discharged from the exhaust pipe 18.

Further, the powder of the powder surface portion which is buried away from the inner surface of the guide shaft 7 can be dug by the forward and reverse rotation operation of the upper stirring member 20 and the reciprocating operation in the vertical direction. The bulk material P is exposed to a high temperature internal gas atmosphere. Thereby, the powder material P around the upper stirring member 20 can be heat-treated in no way inferior to the powder material P in the vicinity of the inner surface of the guide shaft 7 which is advantageous for heating.

When the powder material P that has moved downward in the direction of gravity by the discharge operation of the lower discharge unit 4 reaches below the upper agitating member 20, it is stably heated by the heater 8, and the graphitization treatment is appropriately obtained.

When the powder material P is further moved downward, the stirring action of the graphite lower agitating member 5 is performed in the same manner as the upper agitating member 20, whereby the fluidity of the powder material in the guide shaft 7 is improved. Since high fluidity can be ensured in this manner, the powder material P can be prevented from being partially quenched, and the heat treatment speed can be fixed, and the powder material P and the guide shaft 7 around the lower agitating member 5 can be further The powder material P near the inner surface is uniformly heat-treated.

The powder material P subjected to the heat treatment in the heating belt H is moved to the cooling belt C having the cooling jacket 10, and is cooled by the cooling unit 4 when it reaches the lower discharge portion 4. The cooled powder P is discharged from the lower discharge portion 4. Since the fluidity of the powder material P is lifted by the lower agitating member 5 before moving to the cooling zone C, partial quenching is prevented, so that bridging of the cooling zone C can be prevented.

Specifically, as shown in FIG. 5( a ), assuming that the single agitating member G is integrally formed by connecting the upper agitating member 20 and the lower agitating member 5 , the rotation of the agitating member G and Moving up and down, the powder material P around the stirring member G will quickly flow down along the stirring member G, from On the upper surface S of the powder, a depression D is generated. In other words, in the vicinity of the inner surface of the guide shaft 7 and the vicinity of the agitating member G, the moving speeds V and v (V>v) of the powder material P are different, and thus the necessary heat treatment cannot be appropriately performed.

On the other hand, in the present embodiment, as shown in FIG. 5(b), the lower agitating member 5 is provided with a distance from the upper agitating member 20 in a state in which the single agitating member G is cut. Thereby, the retention region Z of the powder material P which is a region where the agitation members 5 and 20 are not present can be formed inside the guide shaft 7. Thereby, the powder material P can be prevented from flowing down in the vicinity of the upper stirring member 20, so that the powder material P can be circulated and moved in the upper portion, and the powder material P can be sufficiently subjected to heat treatment and gas release. At the same time, the powder material P can be caused to circulate in the vicinity of the lower agitating member 5.

Further, as shown in Fig. 1, the temperature distribution inside the guide shaft 7 is the temperature at the upper end of the heating belt H on the upper end portion 7a side of the guide shaft 7 (indicated by 7U in the drawing) due to the newly charged low-temperature powder. The bulk material P or the heat from the upper casing 11 becomes relatively low, and the temperature of the lower end of the heating belt H (shown as 7L in the drawing) connected to the cooling zone C in the guide shaft 7 is also received from the cooling zone C. The thermal influence such as heat conduction is relatively low, and the maximum temperature is formed in the central portion of the guide shaft 7 (indicated by 7C in the drawing).

Since the agitation member is set as the upper agitation member 20 and the lower agitation member 5, and the retention zone Z in which the highest temperature is formed is set between them, the powder material P can be sufficiently heated in the retention zone Z. At the same time, the stirring members 5, 20 can be prevented from being exposed to an excessive temperature, thereby ensuring stirring. Durability of the members 5, 20.

Further, as described above, the powder material P can be circulated and moved by the lower agitating member 5 at the lower portion of the guide shaft 7, so that the bridging of the powder material P immediately after cooling can be avoided.

As described above, the upper agitating member 20 and the lower agitating member 5 can ensure uniform heating of the degassing treatment and the powder material P, and can promote gas release and avoid bridging, so that it can be realized so far. The diameter of the difficult guide shaft 7 is increased to improve productivity.

Since the upper agitating member 20 is coupled to the metal brake force transmitting member 21 and the power transmitting member 21 is rotatably and slidably inserted into the upper casing 11 via the sealing material 25, the heat treatment of the inside of the furnace casing 2 can be performed. The department ensures a high air tightness.

It is intended to use Patent Document 1 as a premise technology, and to apply the techniques of Patent Documents 2 to 6, which are applied to a general apparatus for processing a powder inside a cylindrical shaft and are prevented by stirring. However, as described above, for the heat treatment at a high temperature of 1,500 ° C or higher, the bridge preventing mechanism or the like provided in the hopper apparatus or the like which is used at substantially normal temperature cannot be directly applied. Further, in the powder heat treatment apparatus 1 of the present embodiment, not only the stirring operation but also the upper stirring member 20 and the lower stirring member 5 are provided, and the stirring members 5 and 20 are separated from each other by the distance. By arranging, it is possible to obtain various and advantageous effects that cannot be obtained by simply combining the patent documents as follows. It is possible to prevent the powder material P from flowing down rapidly and to keep the powder material P between the stirring members 5 and 20, and to cause the powder material P to circulate in the upper and lower portions of the guide shaft 7, thereby promoting gas release or heating. It is uniform in heat and can avoid bridging, thereby improving heat treatment performance, or increasing the diameter of the guide shaft 7 to improve productivity.

FIG. 3 and FIG. 4 show a modification of the stirring members 5 and 20. In the above embodiment, the agitating members 5a and 20a are provided for agitation. However, in consideration of the case where the agitating members 5a and 20a having a large surface area are deformed or damaged by heat, a plurality of shaft bodies 34 may be provided. Instead of the agitating members 5a and 20a, the equiaxed bodies 34 penetrate the agitating members 5 and 20 in the radial direction of the agitating members 5 and 20, and are agitated by the isospins 34. Of course, such a modification can also achieve the same operational effects as those of the above embodiment.

Further, as shown in FIG. 6, the heating device 35 is incorporated in the lower agitating member 5, and is connected to an external power source via a flexible cord 36 that can absorb the rotation of the lower agitating member 5 and move up and down. When the 37 is connected, the heating device 35 can ensure the shortening of the heating time and the improvement of the thermal history of the powder material P with respect to the lower portion of the guide shaft 7. Of course, if the heating device 35 is also incorporated in the upper agitating member 20, the same effect can be ensured for the upper portion of the guide shaft 7.

1‧‧‧ powder heat treatment unit

2‧‧‧ furnace shell

3‧‧‧Top loading department

4‧‧‧ below the discharge department

5‧‧‧Bottom agitating member

5a‧‧‧Stirring parts

6‧‧‧Internal Department

7‧‧‧Guide axis

7a‧‧‧The upper end of the guide shaft

7b‧‧‧ opening at the lower end of the guide shaft

8‧‧‧heater

9‧‧‧Insulation materials

10‧‧‧Water-cooled casing

11‧‧‧Upper casing

12‧‧‧Supply hopper

13‧‧‧Opening and closing valve

14‧‧‧Feeder

15‧‧‧ Turntable

15a‧‧‧ cut out the hole

16‧‧‧ disk sets

16a‧‧‧Drain port

17‧‧‧Rotary motor

18‧‧‧Exhaust pipe

19‧‧‧Regulator

20‧‧‧Upper agitating member

20a‧‧‧Stirring parts

20b‧‧‧End flange of the upper stirring member

21‧‧‧Power transmission components

21a‧‧‧End flange of power transmission member

21b‧‧‧External thread

22‧‧‧ upper pedestal

23‧‧‧Upper drive components

24‧‧‧Upper through hole

25‧‧‧ Sealing material

26‧‧‧Coupling components

26a‧‧‧Mask thread

27‧‧‧ keys

28‧‧‧Lower pedestal

29‧‧‧lower drive components

30‧‧‧low through hole

31‧‧‧ Sealing material

32‧‧‧ position sensor

33‧‧‧Temperature Sensor

34‧‧‧Axis

35‧‧‧ heating device

36‧‧‧Soft wire

37‧‧‧External power supply

C‧‧‧Cooling belt

D‧‧‧ dent

G‧‧‧Single stirring member

H‧‧‧heating belt

P‧‧‧ powder material (powder)

S‧‧‧ powder upper surface

V‧‧‧ moving speed of powder material near the surrounding agitating member

v‧‧‧The speed of movement of the powder material near the inner surface of the guide shaft

W‧‧‧Cooling water

Z‧‧‧ stranded area

7U‧‧‧ upper end of the heating belt on the upper end side of the guide shaft

7L‧‧‧The lower end of the heating belt connected to the cooling belt in the guide shaft

7C‧‧‧Center of the guide shaft

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side cross-sectional view showing a preferred embodiment of a powder heat treatment apparatus of the present invention.

Fig. 2 is an enlarged cross-sectional view showing a portion A in Fig. 1.

Fig. 3 is a partially enlarged side elevational view showing a modification of the upper side and the lower side agitating members used in the powder heat treatment apparatus shown in Fig. 1.

Figure 4 is a cross-sectional view taken along line B-B of Figure 3.

Fig. 5 is an explanatory view for explaining a flow state of a powder material in the powder heat treatment apparatus shown in Fig. 1.

Fig. 6 is a schematic block diagram showing a state in which a heating device is incorporated in a lower agitating member of the powder heat treatment apparatus of Fig. 1;

1‧‧‧ powder heat treatment unit

2‧‧‧ furnace shell

3‧‧‧Top loading department

4‧‧‧ below the discharge department

5‧‧‧Bottom agitating member

5a‧‧‧Stirring parts

6‧‧‧Internal Department

7‧‧‧Guide axis

7a‧‧‧The upper end of the guide shaft

7b‧‧‧ opening at the lower end of the guide shaft

8‧‧‧heater

9‧‧‧Insulation materials

10‧‧‧Water-cooled casing

11‧‧‧Upper casing

12‧‧‧Supply hopper

13‧‧‧Opening and closing valve

14‧‧‧Feeder

15‧‧‧ Turntable

15a‧‧‧ cut out the hole

16‧‧‧ disk sets

16a‧‧‧Drain port

17‧‧‧Rotary motor

18‧‧‧Exhaust pipe

19‧‧‧Regulator

20‧‧‧Upper agitating member

20a‧‧‧Stirring parts

21‧‧‧Power transmission components

22‧‧‧ upper pedestal

23‧‧‧Upper drive components

24‧‧‧Upper through hole

25‧‧‧ Sealing material

28‧‧‧Lower pedestal

29‧‧‧lower drive components

30‧‧‧low through hole

31‧‧‧ Sealing material

32‧‧‧ position sensor

33‧‧‧Temperature Sensor

A‧‧‧ will be enlarged in Figure 2

C‧‧‧Cooling belt

H‧‧‧heating belt

P‧‧‧ powder material (powder)

W‧‧‧Cooling water

Z‧‧‧ stranded area

7U‧‧‧ upper end of the heating belt on the upper end side of the guide shaft

7L‧‧‧The lower end of the heating belt connected to the cooling belt in the guide shaft

7C‧‧‧Center of the guide shaft

Claims (3)

A powder heat treatment apparatus comprising: an upper loading portion that can be filled with a powder material; and a heat treatment portion that is connected below the upper loading portion to allow the loaded powder material to be directed The lower side of the gravity direction is heat-treated; the lower discharge portion is connected below the heat treatment portion to discharge the heat-treated powder; and the upper agitating member is inserted from above the heat treatment portion Agitating the powder surface portion of the powder material in the heat treatment portion and the periphery thereof; and inserting the lower agitating member upward from the lower portion of the heat treatment portion and at a distance from the upper stirring member for The powder material in the heat treatment portion is stirred; and a driving element that drives the upper agitating member and the lower agitating member. The powder heat treatment apparatus according to the first aspect of the invention, wherein the upper agitating member is made of graphite, and a metal braking force transmission member is coupled to the upper agitating member, and the metal braking force transmission member is freely permeable via a sealing material. The heat treatment portion is inserted into the heat treatment portion by rotation and sliding. The powder heat treatment apparatus according to claim 1 or 2, wherein a heating device is incorporated in at least one of the upper agitating member and the lower agitating member.